powers of the square root of 2: f/1, f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22, f/32, f/45, f/64, f/90, f/128, etc. Each element in the sequence...

The f-number is the ratio of the lens's focal length to the diameter of the entrance pupil. F-number or F number also may refer to: F number (chemistry)...

by the f-number, written f/N, where N is the f-number given by the ratio of the focal length f to the diameter of the entrance pupil D: N = f D . {\displaystyle...

F number is a correlation number used in the analysis of polycyclic aromatic hydrocarbons (PAHs) as a descriptor of their hydrophobicity and molecular...

c f 2 {\displaystyle {\text{DOF}}\approx {\frac {2u^{2}Nc}{f^{2}}}} for a given maximum acceptable circle of confusion c, focal length f, f-number N,...

A large number of variants of the General Dynamics F-16 Fighting Falcon have been produced by General Dynamics, Lockheed Martin, and various licensed manufacturers...

A number is a mathematical object used to count, measure, and label. The most basic examples are the natural numbers 1, 2, 3, 4, and so forth. Numbers...

(using round numbers) f/2 – f/4, f/4 – f/8, and f/8 – f/16 or (for a slower lens) f/2.8 – f/5.6, f/5.6 – f/11, and f/11 – f/22. These are not sharp divisions...

events. F with diacritics: Ƒ ƒ Ḟ ḟ ᵮ ᶂ Ꞙ ꞙ : F with stroke is used in the Anthropos phonetic transcription system and older Ewe writing ꬵ : Lenis F is used...

The Lockheed Martin F-35 Lightning II is an American family of single-seat, single-engine, supersonic stealth strike fighters. A multirole combat aircraft...

f-number. Accordingly, as illustrated at right, a guide number can be factored to a small f‑number times a long distance just as readily as a large f‑number...

shutter and film winding mechanisms. As a result of the enormous increase in f-number, to maintain similar exposure times, the photographer must use a fast film...

analysis of binary classification and information retrieval systems, the F-score or F-measure is a measure of predictive performance. It is calculated from...

surface ocean f-number, f-ratio, or focal ratio, the ratio of the focal length of an optical system to the diameter of its entrance pupil F-number (disambiguation)...

field. It is equivalent to adjusting the f-number inversely in proportion to crop factor – a smaller f-number for smaller sensors (this also means that...

itself. The total number of cardinals from 1099 to 1986 has been about 2,900, nearly half of whom were created after 1655. This number excludes possible...

The Boeing F-47 is a planned American air superiority sixth-generation fighter aircraft under development by Boeing for the United States Air Force (USAF)...

reduction in the future number of fighter fleets to "four plus one": the F-22 followed by NGAD, the F-35A, the F-15E followed by F-15EX, the F-16 followed by "MR-X"...

and vertical lines in the number spiral correspond to polynomials of the form f ( n ) = 4 n 2 + b n + c {\displaystyle f(n)=4n^{2}+bn+c} where b and...

The General Dynamics F-16 Fighting Falcon is an American single-engine supersonic multirole fighter aircraft originally developed by General Dynamics...

supplement the F-22 with an advanced Eagle variant, the F-15EX, in order to retain an adequate number of air superiority fighters. The F-15 remains in...

photography, exposure value (EV) is a number that represents a combination of a camera's shutter speed and f-number, such that all combinations that yield...

Look up F or f in Wiktionary, the free dictionary. F is the sixth letter of the Latin alphabet. F may also refer to: F or f, the number 15 in hexadecimal...

The McDonnell Douglas F/A-18 Hornet is an all-weather supersonic, twin-engine, carrier-capable, multirole combat aircraft, designed as both a fighter...

we find x = 1.22 λ f d , {\displaystyle x=1.22\,{\frac {\lambda \,f}{d}},} but f d {\displaystyle {\frac {f}{d}}} is the f-number of a lens. A typical...

"Axel F" is an electronic instrumental track by German musician Harold Faltermeyer. The track served as the theme tune to the film Beverly Hills Cop,...

diameter, or minimum f-number, of a photographic lens. A lens with a larger than average maximum aperture (that is, a smaller minimum f-number) is called a "fast...

heavier-duty F-250 through F-450 pickups, F-450/F-550 chassis cabs, and F-600/F-650/F-750 Class 6–8 commercial trucks. The F-Series was first introduced in 1948...

subject in direct sunlight." In simplest terms, bright sun = f:16 @ 1/film-speed-number (aperture and shutter speed, respectively). For example: On a...

= number whose sum of even digits and sum of odd digits are even 1044 = sum of distinct powers of 4 1045 = octagonal number 1046 = coefficient of f(q)...